Re: [RAM] Re: LISP-01 I-D

[marcelo bagnulo braun <marcelo at it.uc3m.es>]

Hi dino,


thanks for the draft
just took a quick read on this....

One comment:

As i understand it, the new version of LISP described in this 01  
version of the draft, no longer uses pure IP in IP tunneling, but  
adds a LISP header to the packets (which contains the nonce for  
security reasons) right?

In section 7, it is stated that:

7.  Router Performance Considerations

   LISP is designed to be very hardware-based forwarding friendly.  By
   doing tunnel header prepending [RFC1955] and stripping instead of  
re-
   writing addresses, existing hardware could support the forwarding
   model with little or no modification.

MB> in the new version, not only the IP header needs to be added but  
also the LISP header, so i guess this is not the only action that  
needs to be performed. Would this still be hardware friendly meaning  
that you could do little reprogramming of the software in the router  
to support that? I mean, this appending of the LISP header is  
supposed to be done for every data packet, right? In the previous  
version, when IP in IP tunneling was used, i guess the IP in IP  
encapsulation was already available in hardware, but i guess that the  
new LISP header will need to be added to the hardware?

   Where modifications are
   required, they should be limited to re-programming existing hardware
   rather than requiring expensive design changes to hard-coded
   algorithms in silicon.

   A few implementation techniques can be used to incrementally
   implement LISP:


   o  On an ITR, prepending a new IP header is as simple as adding more
      bytes to a MAC rewrite string and prepending the string as  
part of
      the outgoing encapsulation procedure.  Many routers that support
      GRE tunneling [RFC3056] or 6to4 tunneling [RFC2784] can already
      support this action.

MB> same applies here, not only adding the outer IP header is needed  
but also the new LISP header needs to be added

Regards, marcelo





 El 05/07/2007, a las 7:11, Dino Farinacci escribió:

> > Please post your new version to the RAM list soon - I am keen to
> > read it.
>
> Enclosed.
>
> Dino
>
> <draft-farinacci-lisp-01.txt>
>
> _______________________________________________
> RAM mailing list
> RAM at iab.org
> https://www1.ietf.org/mailman/listinfo/ram


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